It's Butterfly Bush "Ellen's Blue!"
As you can see, it's not really blue. I think it's a lovely color, though. This particular buddleia has a more compact habit than the others. Unlike "Petite Plum," which only pretends to be petite!
"White Profusion," "Miss Ruby" and "Peach Cobbler" still haven't bloomed. I think that "Miss Ruby" will be next.